That’s very interesting the results can vary so much. If TA lumen tube measured 16k lumens for the R90C while not being able to capture a portion of the light, I would take the bathroom ceiling bounce results as more accurate. Maybe because the R90C is floodier than the MT09R, it reads higher in the bathroom where some of the light gets bounced off the wall back to the lux sensor.
I got a broken ms12 on the date of arrival. I still havent got an email response from banggood after 9 business days. i sent email again and also forwarded the email to imalent…
I just received my R90C. The head is actually about the size of my 4” TA tube. Maybe some of the light is hitting the lip of the pipe bell but I’m still a bit disappointed that it only measures 13,370 lumens at 1s.
Set the exposure to the lowest mode and took pics of the leds at turbo but didnt notice any leds that were obviously dimmer. I remeasured many times after vigorously cleaning contacts and saw no change in output. Newlumen remeasured again tonight amd got 16k lumens. I think I just got unlucky with this unit.